Solutions for greater strength and durability in concrete

Silica Fume Cement

SUSTAINABILITY

WHY CHOOSE SILICA FUME CEMENT?

Silica fume is a by-product from the manufacture of silicon metal. Our silica fume is over 90% pure silicon dioxide and is extremely fine, in fact, approximately 100 times finer than Portland cement. As a highly reactive pozzolan, silica fume combines with cement to enhance the strength and durability of concrete. The use of silica fume in concrete greatly contributes to extended service life and reducing life-cycle costs. As a result, concrete structures have lower environmental impacts contributing to achieving higher ratings towards sustainability in green building codes.

Silica Fume Cement is ideal for high performance concrete (HPC) where very high strength is required. It is commonly used in applications such as high-rise construction, HPC infrastructure, and shotcrete rehabilitation. Not only are higher compressive strengths easily attained, but there is also the added benefit of early strength gain. Concrete using Silica Fume Cement exhibits accelerated strength development, with less bleeding, resulting in early form stripping and quicker turnover. This is also beneficial to precast concrete manufacturers. Silica Fume Cement, when used in conjunction with Supplementary Cementitious Materials (SCM’s) and in properly proportioned mix designs, can help to achieve high Modulus of Elasticity (MOE) concrete. High-MOE concrete contributes to reducing column sizes in high-rise construction and effectively increases the floor space in the resulting structure.

HIGHER COMPRESSIVE, FLEXURAL STRENGTH, AND MODULUS OF ELASTICITY

A representation of size relativity. The largest is a particle of portland cement, 60 times larger than the smallest - a particle of silica fume, (

INCREASED RESISTANCE TO CHEMICAL ATTACKSilica Fume Cement has proven to be effective in resisting alkali aggregate reactivity and sulphate attack, as well as the ingress of de-icing salts and other chemical agents. As a result the durability and service life of a structure is vastly improved.

Silica Fume Cement has proven to be effective in the mitigation of Alkali-Silica Reactivity (ASR) in concrete on its own and in combination with other Supplementary Cementitious Materials (SCM’s). CSA A23.2-27A and ASTM C1778 recognize silica fume as an effective mitigation measure for ASR. The ability to mitigate ASR is dependant on the potential reactivity of the aggregates in use, as well as the concrete mix design. Mitigation measures proposed should be confirmed through applicable test methods using actual project materials.

INCREASED RESISTANCE TOALKALI-SILICA REACTIONS (ASR)

DECREASED PERMEABILITYUpon hydration, Silica Fume Cement produces a dense concrete with a pore structure that is less permeable than a standard concrete mix. The chart to the left shows the improved permeability of concrete mixtures incorporating 25% CemPlusTM slag cement with Portland cement and Silica Fume cement, when tested according to ASTM C1202 and CSA A23.2-23C. This feature makes Silica Fume Cement ideal for a wide range of applications; from containment tanks, to bridges and parking structures, to pipe manufacturing. With decreased permeability, Silica Fume Cement has been shown to be effective in protecting reinforcing steel

Chloride Permeability Rating

Chloride Permeability

Rating

Charged Passed

>4000

High

55 Industrial StreetToronto, ON M4G 3W9

416.423.1300

www.stmaryscement.com

Canada Sales OfficeCanada Sales Office

9333 Dearborn StreetDetriot, MI 48209

313.842.4600

www.stmaryscement.com

United States Sales OfficeUnited States Sales Office

For more information or specific needs such as Environmental Product Declarations (EPD’s),Safety Data Sheets, and Product Data Sheets, contact your sales or technical services representa-tive, or visit the St Marys Cement website at www.stmaryscement.com.

St Marys Cement has an experienced technical services department ready to provide assis-tance regarding the use of Silica Fume Cement in concrete.

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